This document discusses different ways that sentences and parts of a text can be related, including through reference, substitution, ellipsis, conjunctions, and lexical cohesion. It provides examples of each: reference is shown through pronouns like "he" referring to "Pedro" previously mentioned. Substitution and ellipsis are replacing or omitting items, like replacing "another part of the group" with "another part." Conjunctions show relationships between clauses, like "however" contrasting ideas. Lexical cohesion uses similar vocabulary to link ideas, like repeated words around "patients" and their care. Understanding these connections between parts of a text helps in comprehending the overall meaning.